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Copper-based sliding material

Active Publication Date: 2011-08-25
DAIDO METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007]The present invention has been made in view of the aforementioned circumstances. An object of the present invention is to suppress coarsening of a B

Problems solved by technology

At this time, the Cu alloy powder particles 4 are not sufficiently sintered, and they are not sufficiently bonded.
Since a dynamic load is applied on the bearing, a crack is likely to be developed from the coarse Bi phase 3 or the grain boundary between the Bi phase 3 and the Cu phase, possibly resulting in fatigue breakdown of the Cu alloy layer 2.
However, when sintering is performed at

Method used

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Examples

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examples

[0047]Examples 1 to 18 of a Bi-containing Cu alloy according to an embodiment of the invention, and Comparative Examples 21 to 30 were measured with the average particle size of a Bi phase and subjected to a bearing fatigue test. Table 1 shows compositions of Examples 1 to 18 and Comparative Examples 21 to 30. As for Examples 1 to 18, a Cu alloy powder was produced by an atomizing process and mixed with an inorganic compound with use of a general mixer. In this way, the inorganic compound was embedded in the Bi phase on a surface of the Cu alloy powder particle so as to satisfy the component ratio in Table 1. Subsequently, the powder mixture was scattered onto a steel strip and subjected to repeated sintering and rolling processes to produce a sliding material. The sintering was performed at a temperature of 850° C. The sliding material was formed into a semi-cylindrical shape to produce a sliding bearing.

TABLE 1ContentInorganic compoundInorganiccompoundspecificBi phase ingravity / Bi...

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Abstract

Provided is a copper-based sliding material including a steel back-metal layer and a Cu alloy layer. The Cu alloy layer contains, by mass %, 10 to 30% of Bi, 0.5 to 5% of an inorganic compound, and the balance being Cu and inevitable impurities. The Cu alloy layer may further contain 0.5 to 5% of Sn and/or at least one element selected from the group consisting of Ni, Fe, P and Ag in a total amount of 0.1 to 10%. The inorganic compound has an average particle size of 1 to 5 μm and a specific gravity of 70 to 130% relative to the specific gravity of Bi. Bi phase is formed in the Cu alloy layer in an average particle size of 2 to 15 μm, and the Bi phase is dispersed in the Cu alloy layer and isotropic.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to a copper-based sliding material having excellent fatigue resistance, and in particular a copper-based sliding material suitable for a sliding bearing material used in an internal combustion engine.BACKGROUND OF THE INVENTION[0002]Conventionally, a copper-based sliding material for use in a sliding bearing for an internal combustion engine has been generally manufactured by a continuous sintering process. In the continuous sintering process, a Cu alloy powder is continuously scattered onto a steel strip and then sintered and rolled in series. The copper-based sliding material for a sliding bearing has been required to be free of lead (Pb) in order to meet recent environmental restrictions, and thus a sintered Cu alloy containing bismuth (Bi) in place of Pb has been proposed (see, for example, JP-B2-3421724, JP-A-2005-200703, JP-A-04-28836 and JP-A-05-263166).[0003]A crankshaft of an internal combustion engine tend...

Claims

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Application Information

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IPC IPC(8): B32B15/01
CPCB22F2303/40Y10T428/12139B22F2998/10B32B15/013C22C9/00C22C32/0047B22F2303/405Y10T428/12063F16C2204/18F16C33/121B22F9/082C22C1/05B22F3/10B22F3/18B22F2301/35B22F2303/01B22F2301/10B22F2303/05B22F2302/10B22F2302/20B22F2302/05B22F2302/45F16C33/12
Inventor IMAI, TAKUOZUSI, KOUJITUJIMOTO, KENTARO
Owner DAIDO METAL CO LTD
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